They go on to confirm many times in the comments that it is, in fact, a game.

Other comments include:

- Reference to the observation that the picture features squares, as opposed to triangles like with Human Revolution.
The implication being (conveyed by Eidos), that two triangles make a square, indicating a sequel.

- Confirmation that the game features Adam Jensen

- Confirmation that the game uses a brand new engine

This is all great news, but I find it rather fishy given the date tomorrow in Canada...

Also, imo, that picture looks like a very bad photoshop. And wouldn't one expect the visual theme for a sequel to be a little more different than just that?